Xamarin.Forms警告:尝试在*不在iOS图像/手势识别器的窗口层次结构中显示其视图上的* [英] Xamarin.Forms Warning: Attempt to present * on * whose view is not in the window hierarchy with iOS image/gesture recogniser

问题描述

我有一个模态导航页面，上面有一个像按钮一样的图像；

I have a modal Navigation page with an image which acts like a button;

<Image Source ="share.png" HeightRequest="32" WidthRequest="32">
    <Image.GestureRecognizers>
        <TapGestureRecognizer Tapped="On_Share" />
    </Image.GestureRecognizers>
</Image>

以及背后的方法；

async void On_Share(object sender, EventArgs e)
{
    if (CrossConnectivity.Current.IsConnected)
    {
        var message = "Share this";
        var title = "Share";
        await CrossShare.Current.Share(new ShareMessage { Text = message, Title = title}, new ShareOptions { ExcludedUIActivityTypes = new[] { ShareUIActivityType.PostToFacebook } });
    }
    else
    {
        NoInternetLabel.IsVisible = true;
    }
 }

当我尝试单击共享图像/按钮时出现错误.我已经在On_Share方法的第一行中添加了断点.他们没有被击中.

I'm getting the error when I try to click on the share image/button. I've put breakpoints into the first line of the On_Share method & they're not being hit.

Warning: Attempt to present <UIActivityViewController: 0x141b60f70> on <Xamarin_Forms_Platform_iOS_ModalWrapper: 0x1419a0920> whose view is not in the window hierarchy!

请注意，这在Android上工作正常，我仅在iOS中看到问题.我不确定发生了什么-单击图像时，我没有尝试显示任何其他窗口或任何其他内容.无论如何，该错误将在进程到达On_Share方法的开始之前出现.我在这里想念什么?

Please note this works fine in Android, I'm only seeing issues in iOS. I'm not sure what is going on - I'm not trying to present any other windows or anything when I click the image. Regardless, the error appears before the process reaches the beginning of the On_Share method. What am I missing here?

该方法现在确实被点击了，但我仍然遇到错误.它必须试图发送共享表并失败...

The method does get hit now, and I'm still getting the error. It must be trying to send up the share sheet and failing...

推荐答案

Share插件最后出现了问题-我们通过使部分代码递归来解决了该问题.

There was a problem with the Share plugin in the end - we resolved it by making part of the code recursive.

GetVisibleViewController过去看起来像这样；

the GetVisibleViewController used to look like this;

UIViewController GetVisibleViewController()
{
    var rootController = UIApplication.SharedApplication.KeyWindow.RootViewController;

    if (rootController.PresentedViewController == null)
        return rootController;

    if (rootController.PresentedViewController is UINavigationController)
    {
        return ((UINavigationController)rootController.PresentedViewController).VisibleViewController;
    }

    if (rootController.PresentedViewController is UITabBarController)
    {
        return ((UITabBarController)rootController.PresentedViewController).SelectedViewController;
    }

    return rootController.PresentedViewController;
}

需要循环搜索以找到顶部的UIViewController；

whereas it needed to cycle through to find the top UIViewController;

UIViewController GetVisibleViewController(UIViewController controller = null)
{
    controller = controller ?? UIApplication.SharedApplication.KeyWindow.RootViewController;

    if (controller.PresentedViewController == null)
        return controller;

    if (controller.PresentedViewController is UINavigationController)
    {
        return ((UINavigationController)controller.PresentedViewController).VisibleViewController;
    }

    if (controller.PresentedViewController is UITabBarController)
    {
        return ((UITabBarController)controller.PresentedViewController).SelectedViewController;
    }

    return GetVisibleViewController(controller.PresentedViewController);
}

我提出了这个问题，并在 github

I've raised the issue and submitted a pull request on the github

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